units enumertion

hi, when i program pressure.unit=3 it should be in MPa but it is still in N/m2. any ideas why? according to this:

http://help.solidworks.com/2012/English/api/swsimulationapi/SolidWorks.Interop.cosworks~SolidWorks.Interop.cosworks.swsStrengthUnit_e.html

I´ve tried all numbers even typing the name but i cant get MPa.

SolidworksApi macros